220 S. J. JOHNSTON. 



It extends back as far as the ovary. The vesicula seminalis 

 is filled with sperms. The genital pore lies in the middle 

 line a little in front of the ventral sucker. 



The ovary is a conspicuous oval structure, 0*069 x 0*058 

 mm., lying some distance behind the ventral sucker and to 

 one side of the middle line. A large " shell-gland" lies 

 immediately behind it. The testes lie in the posterior third 

 of the body, close together, one behind the other in the 

 middle line. They are oval in shape, with the long axis 

 longitudinal, and the auterior (0*096 x 0*0801 mm.)is slightly 

 smaller than the posterior (0*106 x 0*0801 mm.). The yolk- 

 glands consist of very small, rounded follicles 0*014 mm. in 

 diameter. They extend from the anterior border of the 

 ventral sucker to the posterior end of the intestine. As 

 far back as the ovary they are confined to the lateral fields 

 lying between the intestinal limbs and the sides of the body, 

 but behind the ovary they spread out on the ventral surface 

 of the intestinal limbs, but do not anywhere extend inwards 

 towards the middle line beyond the inner edges of the 

 intestine. The uterus is short and does not extend back 

 beyond the shell-gland. There is a long Laurer's canal. 

 The uterus contains no eggs, though the ovary has every 

 appearance of being mature, and the vesicula seminalis is 

 filled with sperms. 



The other species of Dolichosaccus^ are parasitic in 

 Frogs and do not seem to be very closely related to the 

 the present species, which indeed, with some doubts, I 

 include in this genus. It differs from the three species 

 from frogs in its cylindrical form, in the relative size of 

 the two suckers and in the topography of the fields of the 

 yolk-glands. 



Subfamily MICROPHALLIN^J. 



Levinseniella hovvensis, sp. n. (Fig. 13.) 

 Diagnosis, — Minute worms, rather less than a millimetre 

 long; elongated pear-shaped, flattened dorso-ventrally. 



